96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
#include "fs.hpp"
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INode_Allocator::INode_Allocator(Fs *fs, u_int64_t block_segment_start,
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u_int64_t block_segment_end) {
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fs = fs;
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block_segment_start = block_segment_start;
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block_segment_end = block_segment_end;
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max_num_inodes = (block_segment_end - block_segment_start) * INODES_PER_BLOCK;
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}
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u_int64_t INode_Allocator::get_block_num(u_int64_t inode_num) {
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u_int64_t block_num =
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block_segment_start + (inode_num / INODES_PER_BLOCK);
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if (block_num >= block_segment_end)
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return 0;
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return block_num;
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}
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u_int64_t INode_Allocator::get_block_offset(u_int64_t inode_num) {
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return (inode_num % INODES_PER_BLOCK) * INODE_SIZE;
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}
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int INode_Allocator_Freelist::new_inode(u_int64_t uid, u_int64_t gid,
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u_int64_t permissions,
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INode_Data *inode_data) {
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char buf[BLOCK_SIZE];
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int err;
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u_int64_t inode_num = fs->superblock.inode_list_head;
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if(inode_num > max_num_inodes)
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return -1;
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u_int64_t block_num = get_block_num(inode_num);
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if(block_num == 0)
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return -1;
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if ((err = disk->read_block(block_num, buf)) < 0)
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return err;
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u_int64_t new_inode_list_head = 0;
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read_u64(&new_inode_list_head, buf);
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if ((err = fs->save_inode_list_head(new_inode_list_head)) < 0)
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return err;
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(*inode_data) = INode_Data(inode_num);
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metadata.uid = uid;
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metadata.gid = gid;
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metadata.permissions = permissions;
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// It is debatable if this function should do this:
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if ((err = fs->save_inode(inode_data)) < 0) {
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inode_data->inode_num = 0xFFFFFFFFFFFFFFFF;
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return err;
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}
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return 0;
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}
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int INode_Allocator_Freelist::free_inode(INode_Data *inode_data) {
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char buf[BLOCK_SIZE];
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int err;
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u_int64_t block_num = get_block_num(inode_data->inode_num);
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u_int64_t block_offset = get_block_offset(inode_data->inode_num);
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if(block_num == 0)
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return -1;
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if ((err = disk->read_block(block_num, buf)) < 0)
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return err;
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write_u64(fs->superblock.inode_list_head, &buf[block_offset]);
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if ((err = disk->write_block(block_num, buf)) < 0)
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return err;
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if ((err = fs->save_inode_list_head(inode_data->inode_num)) < 0)
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return err;
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return 0;
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}
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int INode_Allocator_Freelist::format() {
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char buf[BLOCK_SIZE];
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int err;
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u_int64_t next_inode_num = 1;
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for(u_int64_t i = block_segment_start; i < block_segment_end; ++i) {
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for(int j = 0; j < INODES_PER_BLOCK; ++next_inode_num, ++j)
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write_u64(next_inode_num, &buf[j*INODE_SIZE]);
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if ((err = disk->write_block(i, buf)) < 0)
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return err;
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}
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if ((err = fs->save_inode_list_head(0)) < 0)
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return err;
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return 0;
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}
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